Sensitivity of the optical properties of porous silicon layers to the refractive index of liquid in the pores

Anderson, Michael A.; Tinsley-Bown, A.; Allcock, Philip; Perkins, Elaine A.; Snow, Paul; Hollings, M.; Smith, Richard; Reeves, Christopher L.; Squirrell, D.J.; Nicklin, S.; Cox, T. I.

doi:10.1002/pssa.200306558

Cited by 61 publications

(46 citation statements)

References 6 publications

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“…The reflectivity spectrum of microcavities based on mpSi and μpSi shows a narrow pass-band centred at the wavelength where the light is reflected with the highest intensity. Therefore, the structural design of microcavities based on mpSi and μpSi makes it possible to develop optical pass-band filters and sensors [84,85]. If the current density profile is modified in a sinusoidal manner in the course of the electrochemical etching, the effective refractive index of mpSi and μpSi can be modulated to produce rugate filters, which are another type of optical structure used in optoelectronic and sensing applications ( Fig.…”

Section: Mesoporous and Microporous Siliconmentioning

confidence: 99%

Electrochemical Etching Methods for Producing Porous Silicon

Santos

Kumeria

2015

Electrochemically Engineered Nanoporous Materials

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Porous silicon produced by electrochemical etching of silicon has become one of the most popular materials used in many scientific disciplines as a result of its outstanding and unique set of chemical and physical properties and cost-competitive fabrication processes. To understand the electrochemical mechanisms taking place in the course of the etching of silicon is a key factor to control and modify the structure of this versatile porous material. This makes it possible to produce a broad range of structures, which can range from a porous matrix to arrays of nanowires. These structures are unique and bring new opportunities for multiple research fields and applications such as biotechnology, medicine, optoelectronics, chemistry and so forth. This chapter is aimed at compiling and summarising the fundamental aspects behind the production of porous silicon structures by electrochemical and metal-assisted etching of silicon wafers. Our objective is to provide a simple but detailed overview about the fabrication process of porous silicon, with special emphasis on the different fabrication conditions and geometric and morphological features of the resulting silicon nanostructures.

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Section: Mesoporous and Microporous Siliconmentioning

confidence: 99%

Electrochemical Etching Methods for Producing Porous Silicon

Santos

Kumeria

2015

Electrochemically Engineered Nanoporous Materials

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“…Incorporation of molecules into a porous Si layer alters its index of refraction, and the spectrum obtained from a thin film or multilayer structure provides a measure of loading in the nanostructure. Primarily exploited for molecular binding assays [7,9,10,22,70,149,[164][165][166][167][168][169][170][171][172][173], the optical spectrum can be monitored in vivo, allowing it to indicate the quantity of drug that has diffused out of the film [16] or the degree of degradation of the porous matrix [10]. The optical spectrum also provides a convenient means to characterize and quantify various drug loading or release concepts ex vivo.…”

Section: In Vivo Monitoring Using the Optical Properties Of Porous Simentioning

confidence: 99%

Porous silicon in drug delivery devices and materials☆

Anglin

Cheng

Freeman

et al. 2008

Advanced Drug Delivery Reviews

807

618

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Porous Si exhibits a number of properties that make it an attractive material for controlled drug delivery applications: The electrochemical synthesis allows construction of tailored pore sizes and volumes that are controllable from the scale of microns to nanometers; a number of convenient chemistries exist for the modification of porous Si surfaces that can be used to control the amount, identity, and in vivo release rate of drug payloads and the resorption rate of the porous host matrix; the material can be used as a template for organic and biopolymers, to prepare composites with a designed nanostructure; and finally, the optical properties of photonic structures prepared from this material provide a self-reporting feature that can be monitored in vivo. This paper reviews the preparation, chemistry, and properties of electrochemically prepared porous Si or SiO 2 hosts relevant to drug delivery applications.

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“…Many label free optical biosensors based on porous silicon (PS) material have been developed such as waveguides (Rendina et al, 2007;Rong et al, 2008) based on evanescent waves, Bragg mirrors (Snow et al, 1999;Anderson et al, 2003) and microcavities (Chan et al, 2001;De Stefano et al, 2003;Ouyang et al, 2005) based on the shift of the reflectance spectrum peak. In our recent study (Haji et al 2012), we have demonstrate the feasibility of an ARROW structure based on porous silicon for sensing application even that the refractive index contrast is rather low.…”

Section: Introductionmentioning

confidence: 99%

Towards a biosensor based on anti resonant reflecting optical waveguide fabricated from porous silicon

Hiraoui

Haji

Guendouz

et al. 2012

Biosensors and Bioelectronics

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Recently, we demonstrated that Anti Resonant Reflecting Optical Waveguide (ARROW) based on porous silicon (PS) material can be used as a transducer for the development of a new optical biosensor. Compared to a conventional biosensor waveguide based on evanescent waves, the ARROW structure is designed to allow a better overlap between the propagated optical field and the molecules infiltrated in the porous core layer and so to provide better molecular interactions sensitivity.The aim of this work is to investigate the operating mode of an optical biosensor using the ARROW structure. We reported here an extensive study where the antiresonance conditions were adjusted just before the grafting of the studied molecules for a given refractive index range.The interesting feature of the studied ARROW structure is that it is elaborated from the same material which is the porous silicon obtained via a single electrochemical anodization process.After oxidation and preparation of the inner surface of porous silicon by a chemical functionalization process, bovine serum albumin (BSA) molecules, were attached essentially in the upper layer. Simulation study indicates that the proposed sensor works at the refractive index values ranging from 1.3560 to 1.3655.The experimental optical detection of the biomolecules was obtained through the modification of the propagated optical field and losses. The results indicated that the optical attenuation decreases after biomolecules attachment, corresponding to a refractive index change ∆n c of the core. This reduction was of about 2 dB/cm and 3 dB/cm for Transverse Electric (TE) and 1 Electronic mail : mohamed-lazhar.haji@univ-rennes1.fr 2 Transverse Magnetic (TM) polarizations respectively. Moreover, at the detection step, the optical field was almost located inside the core layer. This result was in good agreement with the simulated near field profiles.

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Sensitivity of the optical properties of porous silicon layers to the refractive index of liquid in the pores

Cited by 61 publications

References 6 publications

Electrochemical Etching Methods for Producing Porous Silicon

Electrochemical Etching Methods for Producing Porous Silicon

Porous silicon in drug delivery devices and materials☆

Towards a biosensor based on anti resonant reflecting optical waveguide fabricated from porous silicon

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